@article{JMPA_1848_1_13__423_0,
     author = {Bertrand, J.},
     title = {Sur la courbe dont les deux courbures sont constantes},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {423--424},
     publisher = {Gauthier-Villars},
     volume = {1e s{\'e}rie, 13},
     year = {1848},
     language = {fr},
     url = {http://www.numdam.org/item/JMPA_1848_1_13__423_0/}
}